US5099806A - Valve system for automobile engine - Google Patents

Valve system for automobile engine Download PDF

Info

Publication number
US5099806A
US5099806A US07/725,606 US72560691A US5099806A US 5099806 A US5099806 A US 5099806A US 72560691 A US72560691 A US 72560691A US 5099806 A US5099806 A US 5099806A
Authority
US
United States
Prior art keywords
oil
rocker arm
plunger
rocker
sub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/725,606
Other languages
English (en)
Inventor
Shinichi Murata
Noboru Nakamura
Michiyasu Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP18213290A external-priority patent/JP2503737B2/ja
Priority claimed from JP18213190A external-priority patent/JP2503736B2/ja
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Assigned to MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA reassignment MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MURATA, SHINICHI, NAKAMURA, NOBORU, YOSHIDA, MICHIYASU
Application granted granted Critical
Publication of US5099806A publication Critical patent/US5099806A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • This invention relates to a valve system for an automobile engine, and more particularly to a mechanism for driving a rocker arm of a valve system for an OHC type engine.
  • valve system for an OHC (overhead camshaft) type engine As is wellknown, with a valve system for an OHC (overhead camshaft) type engine, one end of a seesaw rocker arm is in contact with a driving cam and the other end is in contact with valve stem ends to open and close valves in response to the movement of the cam.
  • OHC overhead camshaft
  • valve system With such a valve system, there have been proposed mechanisms for selectively stopping operation of valves and cylinders to save fuel during low speed and low load running, and for operating the valves efficiently to enhance air intake and gas exhaust during high speed running.
  • FIG. 26 of the accompanying drawings is a cross-sectional view showing a structure of one example of the foregoing mechanism for stopping reciprocation of valves.
  • a reciprocative plunger C is located at a non-rocking portion of a rocker arm A.
  • the plunger C confronts a stop plate D which is movable perpendicularly to the moving direction of the plunger C and has a circular opening D1 at the center thereof as shown in FIG. 27.
  • the plunger C is passable through the opening D1.
  • I stands for a rocker shaft.
  • One end of the stop plate D is coupled to a piston E, which is slidable perpendicularly in the moving direction of the plunger C above the rocking center of the rocker arm A.
  • the piston E is driven by pressure in an oil gallery F connected to a non-illustrated oil pressure controller.
  • valve driving mechanism as well as the plunger C for reciprocating the valve stem is disposed at the rocking portion which is far from the base of the rocker arm. Heavy weight is applied to the rocking portion of the rocker arm, which increases inertia mass, and makes the rocker arm rather slow to operate the valves efficiently during high speed running.
  • Another object of this invention is to provide a valve system having a simple structure to prevent increase of the inertia mass applied to a rocker arm.
  • a valve system for an automobile comprising: a camshaft; a plurality of valves for opening and closing intake ports of engine cylinders; a cam mounted on the camshaft for driving the valves; a rocker shaft pivotally mounted on an engaging housing and disposed adjacent to the camshaft; a main rocker arm fixedly mounted on the rocker shaft, one end of the main rocker arm being disposed against stems of the valves; a sub-rocker arm pivotally mounted on the rocker shaft, one end of the sub-rocker arm being normally biased to be in sliding contact with the cam by a biasing means, and the sub-rocker arm being rockable in response to movement of the cam; engaging means for engaging and disengaging the rocker shaft with and from the sub-rocker; and driving means for driving the engaging means depending upon an operating condition of the engine to engage and disengage the rocker shaft with and from the sub-rocker arm.
  • the camshaft includes a low speed cam and a high speed cam having different profiles
  • the sub-rocker arm includes a low speed rocker arm being rockable in response to the movement of the low speed cam and a high speed cam being rockable in response to the movement of the high speed cam.
  • the engaging means engages the high speed rocker arm with the rocker shaft to drive the valves in response to the movement of the high speed cam.
  • the engaging means engages the low speed rocker arm with the rocker shaft and disengages the high speed rocker arm from the rocker shaft to drive the valves in response to the movement of the low speed cam.
  • the engaging means disengages the high speed rocker arm and the low speed rocker arm from the rocker shaft to stop the valves.
  • the engaging means includes an engaging hole which is on a rotating surface of the sub-rocker arm for angularly moving the rocker shaft, a through hole which is in the rocker shaft and is perpendicular to the axial direction of the rocker shaft and of which central axis coincides with the central axis of the engaging hole when a base circle of the cam is in sliding contact with the sub-rocker arm, and a plunger which is movable between a position in the through hole and a position projecting in the engaging hole and is engaged in the engaging hole when both of the central axes are in agreement.
  • the driving means includes an oil gallery in the rocker shaft in the axial direction thereof, and oil pressuring means for applying oil pressure to the plunger via the oil gallery to operate the plunger and to engage and disengage the rocker shaft with and from the sub-rocker arm.
  • the engaging means further includes a large diameter portion of the through hole of the rocker shaft, the large diameter portion being located near the bottom of the through hole and being larger in diameter than the engaging hole of the sub-rocker arm, a flange mounted on the plunger at a position opposite to the engaging hole and being movable in the large diameter portion of the through hole of the rocker shaft, a convex member located at the bottom of the plunger, and a spring mounted around the plunger in a space between the flange and the large diameter portion and adapted to bias the plunger to keep the flange in the large diameter portion of the through hole.
  • the driving means further includes an oil chamber located in the large diameter portion of the through hole of the rocker shaft, and an oil path of the flange, the oil being to introduce oil from the oil gallery to the oil chamber.
  • the engaging means further includes a spring mounted round the plunger at an end opposite to the engaging hole and adapted to bias the plunger to project the plunger into the engaging hole.
  • the driving means further includes an oil passage which is located in the plunger and has an end open at an upper portion of the plunger and the other end open on a side of the plunger to introduce oil from the oil gallery to a space between the engaging hole and a surface of the plunger in the engaging hole.
  • the oil pressure means includes a pressure oil pump for generating high pressure oil, a path for supplying the high pressure oil to the oil gallery in the rocker shaft, an oil pressure controller located in the high pressure oil supplying path to supply and interrupt oil to and from the oil gallery, and a relief valve for releasing pressure of oil when oil pressure in the high pressure oil supplying path between the oil pressure controller and the pressure oil pump exceeds a predetermined value.
  • the oil pressure controller comprises a solenoid valve for selecting a first position for supplying the high pressure oil from the pressure oil pump to the oil gallery or a second position for connecting the oil gallery to a low pressure oil tank, a solenoid for activating the solenoid valve to select any of the two positions, and a computer for operating the solenoid according to an engine speed and load.
  • the sub-rocker arm has at its one end a roller bearing which is in sliding contact with the cam.
  • Selective operation of the high speed cam or low speed cam can enhance high engine output in the entire engine speed range.
  • FIG. 1 is a perspective view, partially in cross section, of a valve system according to a first embodiment of this invention applied to a DOCH type engine;
  • FIG. 2 is a plan view observed from the direction 2of FIG. 1;
  • FIG. 3 is a perspective view, partially in cross section, of a valve system applied to an OHC type engine
  • FIG. 4 is a plan view observed from the direction of FIG. 3;
  • FIG. 5 is a cross-sectional view taken along 5--5of FIG. 1;
  • FIG. 6 is a cross-sectional view, in enlarged scale, of a main part of the structure shown in FIG. 5;
  • FIG. 7 is a cross-sectional view taken along line 7--7of FIG. 6;
  • FIGS. 8 and 9 are block diagrams showing configurations of oil pressure controllers used for the main part of the valve system of FIG. 1;
  • FIG. 10 is a cross-sectional view similar to FIG. 6, showing a modified example of the main part of FIG. 1;
  • FIG. 11 is a cross-sectional view taken along line ⁇ 11 -- ⁇ 11 of FIG. 10;
  • FIG. 12 is a cross-sectional view similar to FIG. 10, showing operation of a modified example
  • FIG. 13 is a cross-sectional view taking along line ⁇ 13 -- ⁇ 13 of FIG. 12;
  • FIG. 14 is a perspective view, partially in cross section, of a valve system according to a second embodiment of this invention.
  • FIG. 15 is an exploded perspective view showing a main part of the valve system of FIG. 14;
  • FIG. 16 is a cross-sectional view taken along line ⁇ 16 -- ⁇ 16 of FIG. 15;
  • FIG. 17 is a cross-sectional view taken along an axial direction of a rocker shaft of FIG. 14;
  • FIGS. 18 and 19 are block diagrams showing configurations of oil pressure controllers for the main parts shown in FIG. 14;
  • FIG. 20 is a cross-sectional view describing operation of the main parts of FIG. 14
  • FIG. 21 is a cross-sectional view taken along line ⁇ 21 -- ⁇ 21 of FIG. 20;
  • FIG. 22 is a view similar to FIG. 20 showing a modified example of the main part of FIG. 14;
  • FIG. 23 is a cross-sectional view taken along line ⁇ 23 -- ⁇ 23 of FIG. 22;
  • FIG. 24 is a view similar to FIG. 22 showing operation of a modified example
  • FIG. 25 is a cross-sectional view taken along line ⁇ 25 -- ⁇ 25 of FIG. 22;
  • FIG. 26 is a cross-sectional view showing a structure of a conventional valve system
  • FIG. 27 is a cross-sectional view observed from the direction ⁇ 27 of FIG. 26;
  • FIG. 28 is a cross-sectional view similar to FIG. 26, showing operation of the valve system of FIG. 26;
  • FIG. 29 is a cross-sectional view observed from the direction ⁇ 29 of FIG. 28.
  • FIG. 1 A valve system according to a first embodiment of this invention will be described with reference to FIG. 1 through FIG. 13.
  • the valve system 1 comprises a camshaft 2 and a rocker shaft 3, both of which are pivotally mounted on an engine housing.
  • the camshaft 2 has a valve driving cam 4 fixed thereon.
  • the rocker shaft 3 includes a pair of main rocker arms 5, and a sub-rocker arm 6 disposed between the main rocker arms 5 as shown in FIG. 2.
  • each main rocker arm 5 is coupled with the rocker shaft 3 by spline coupling, for example.
  • the other end, i.e. rocking portion, of each main rocker arm is disposed against a stem end of an intake valve 7.
  • a base of the sub-rocker arm 6 is pivotally mounted on the rocker shaft 3.
  • the sub-rocker arm 6 has a roller bearing 8 on its rocking portion.
  • the rocking portion of the sub-rocker arm 6 has an arm portion 6A besides the portion for supporting the roller bearing 8.
  • the arm 6A is in contact with a plunger 11 at an end of a lost motion spring 10 mounted on a cylinder head 9, and is biased to be movable clockwise as shown in FIG. 5, thereby causing the roller bearing 8 to come into pressure contact with the valve driving cam 4.
  • the sub-rocker arm 6 has an opening 6B on its circumferential surface.
  • the opening 6B serves as a path in which a coupling plunger, to be described later, moves upwardly and downwardly.
  • An oil gallery 3A is axially formed at the central portion in the rocker shaft 3 as shown in FIGS. 5 and 7.
  • a through hole 3B is formed in the rocker shaft 3 at a position corresponding to the opening 6B of the sub-rocker arm, and is perpendicular to the oil gallery 3A. As shown in FIG. 6, the center of the through hole 3B and the center of the opening 6B coincide with each other when a base circle of the valve driving cam 4 comes into sliding contact with the roller bearing 8.
  • the through hole 3B has a large diameter portion 3C, which communicates with the oil gallery 3A.
  • a coupling plunger 12 is located in the through hole 3B to be movable to and from the opening 6B.
  • the coupling plunger 12 is normally given downward bias by a compression spring 3 so that a head thereof is in the through hole 3B.
  • the compression spring 13 is positioned in the through hole 3B between a flange 12A at the bottom of the plunger 12 and a support in the rocker shaft 3.
  • the opening 6B of the sub-rocker arm, through hole 3B of the rocker shaft, plunger 12 and compression spring 13 constitute first engaging means.
  • An output path of the oil pressure controller 14 is connected to the oil gallery 3A of the rocker shaft 3 as shown in FIG. 8.
  • the oil pressure controller 14 controls the pressure in the oil gallery 3A according to a running condition of the automobile, and includes electromagnetic solenoid valves 14A and control units 14B as a main part.
  • Each solenoid valve 14A has three paths, i.e. a path from an oil pump 15, a feedback path having an atmospheric pressure, and a path to the oil gallery 3A in the rocker shaft 3. Under the normal condition, i.e. when it is not activated, the solenoid valve 14A is at a first position to introduce oil to the feedback path from the oil gallery 3A.
  • the solenoid valve 14A associated with the high speed running condition is omitted in FIG. 8.
  • the control unit 14B comprises a micro computer, for example.
  • An engine speed sensor 16, an O 2 sensor 17 for detecting an air-to-fuel ratio, and running condition detecting sensors including a throttle position sensor 18 are connected to input units of the control unit 14B.
  • the control unit 14B discriminates the low or high speed running, and load according to data inputted by these sensors, and outputs driving signals to the solenoid valves 14A.
  • the oil gallery 3A, oil pump 17 and oil pressure setting means 14 constitute driving means.
  • the oil pressure controller 14 When the oil pressure controller 14 identifies that input data such as the engine speed, air-to-fuel ratio and accelerator opening satisfy the requirements for driving the air-intake valves 7, one of the solenoid valves 14A is activated. When it is activated, the solenoid valve 14A is switched from the position shown in FIG. 8 to the position shown in FIG. 9 to introduce the pressured oil to the oil gallery 3A from the oil pump 15, thereby raising the pressure in the oil gallery 3A.
  • the sub-rocker arm 6 is driven by the valve driving cam 4 to transmit the driving force to the main rocker arm 5 via the rocker shaft 3, thereby reciprocating the intake valves 7.
  • the rocker shaft 3 controls transmission of the driving force from the ca 4 to the main rocker arm 5 in order to drive the valves.
  • the mechanism for controlling transmission of the driving force is located between the rocker shaft 3 and the sub-rocker arm 6 so that the valve system is applicable to either a DOHC or OHC type engine, thereby allowing the valve system to be designed more freely.
  • the coupling plunger is designed to make upward or downward movement only when the roller bearing comes into contact with the base circle of the cam. Otherwise, the coupling plunger is made not to move, so that the driving force will not be transmitted or interrupted improperly.
  • FIGS. 10 to 13 are cross-sectional view showing the coupling plunger whose head is normally in the opening of the sub-rocker arm.
  • FIG. 10 is a view similar to FIG. 1. As shown in FIG. 10, the opening 6B is formed on the surface of the sub-rocker arm 6 at the position corresponding to the upper part of the through hole 3B. A receptor is formed at the upper end of the opening 6B, and is larger in diameter than the opening 6B. A cover 19 is fastened on the receptor by caulking.
  • the coupling plunger 20 has an oil path 20 A, one end of which communicates with the oil gallery 3A and the other end of which is open at the upper portion under the cover 19. Further, the coupling plunger 20 includes a cylindrical portion 20B at its bottom. The cylindrical portion 20B is open downwardly and is closed at the top. In the cylindrical portion 20B, the compression spring 22 is disposed on the spring receptor 21 attached on the inner circumferential surface of the rocker arm 6.
  • the coupling plunger 20 is biased by the compression spring 22 to project its head to the opening 6B.
  • the holes on the sub-rocker arm 6 and the spring receptor 21 are for introducing air to compress and expand the compression spring 22.
  • the second engagement means comprises the opening 6B of the sub-rocker arm 6, through hole 3B of the rocker shaft 3, plunger 20 and compression spring 22.
  • the coupling plunger 20 keeps its head in the opening 6B when the oil pressure in the oil gallery 3A is not increased. Therefore, the rocker shaft 3 and the sub-rocker arm 6 remain coupled and are driven by the cam to open and close the valves, and are receiving the driving force. The rocker shaft 3 and the sub-rocker shaft 6 assume this posture during the high or low speed running.
  • the pressured oil is also supplied to the oil path 20A in the coupling plunger 20, and is discharged through the opening above the plunger 20, thereby lowering the plunger 20 against the bias of the compression spring 22. Then, the plunger 20 is moved to the position in which its head is in the through hole 3B, thereby interrupting the transmission of the driving force between the rocker shaft 3 and the sub-rocker arm 6.
  • FIGS. 14 to 25 A valve system according to a second embodiment of this invention will now be described with reference to FIGS. 14 to 25.
  • the valve system of this embodiment is characterized in that it includes a mechanism for controlling timing to open or close the valves during high or low speed running and for selectively stopping operation of valves during low speed running.
  • FIG. 14 shows the valve system 30 for a DOHC type engine.
  • the valve system 30 comprises a camshaft 32 and a rocker shaft 33 which are pivotally supported on an engine housing.
  • the camshaft 32 includes a low speed cam 34 having a small lift and a high speed cam 35 having a large lift, both of which are fixedly mounted on the camshaft 32.
  • the rocker shaft 33 includes a main rocker arm 36 and a pair of sub-rocker arms 37, 38.
  • the main rocker arm 36 is coupled with the rocker shaft 33 at its base by spline coupling, for example, and is in contact with valve stem ends of intake valves 39 at its other end (rocking portion), for example.
  • bases of the sub-rocker arms 37, 38 are pivotally mounted on the rocker shaft 33.
  • Roller bearings 40 are mounted on the rocking portions of the sub-rocker arms 37, 38.
  • the rocking portions of the sub-rocker arms 37, 38 have arm portions 37A, 38A besides the supports for the roller bearings 40.
  • the arm portion 37A is in contact with a plunger 42 at the end of the lost motion spring 42 of the cylinder head 41, and is biased to move clockwise as shown in FIG. 16, thereby causing the roller bearing 40 to come into pressure contact with the cam.
  • the sub-rocker arms 37, 38 have openings 37B, 38B, respectively, on the outer circumferential surfaces thereof as shown in FIG. 17.
  • openings 37B, 38B coupling plungers, to be described later, are movable upwardly and downwardly.
  • the oil gallery 33A is axially formed in the rocker shaft 33.
  • through holes 33B are formed at positions corresponding to the opening 37B, 38B, and are perpendicular to the oil gallery 33A as shown in FIG. 16.
  • the through holes 33B are arranged so that they coincide with the holes 37B, 38B at the centers thereof when the base circles of the cams 34, 35 come into contact with the roller bearings 40.
  • the coupling plungers 44 are located in the through holes 33B to be movable into and from the opening 37B, 38B, respectively.
  • the coupling plungers 44 are downwardly biased by the compression springs 45, located between the bottom of the through holes 33B and support members in the rocker shaft 33, so that the head portions of the coupling plungers 44 are in the through holes 33B.
  • the openings 37B, 38B of the sub-rocker arms 37, 38, through holes 33B of the rocker shaft 33, plungers 44 and compression spring 45 constitute the first engaging means.
  • An output path of an oil pressure controller 46 shown in FIG. 18 is connected to the oil gallery 33A of the rocker shaft 33.
  • the oil pressure controller 46 controls the pressure in the oil gallery 33A according to the running condition of the automobile, and comprises electromagnetic solenoid valves 46A and control units 46B as main parts.
  • the solenoid valves 46A are used for the high speed running and low speed running, respectively.
  • Each of the valves 46A has a path from the oil pump 46, a feedback path having an atmospheric pressure, and a path to the oil gallery 33A in the rocker shaft 33.
  • each solenoid valve 46A is set at a first position to introduce oil from the oil gallery 33A to the feedback path.
  • the solenoid valve 46A for the high speed running is omitted in FIG. 18.
  • the oil pressure controller 46B comprises a micro-computer, for example.
  • An engine speed sensor 48, an O 2 sensor for detecting air-to-fuel ratio, and various sensors including a throttle position sensor 50 are connected to input units of the controller 46B.
  • the controller 46B discriminates high or low speed running and load condition according to data inputted by these sensors, and outputs driving signals to one of the electromagnetic solenoid valves 46A, associated with the high and low speed running.
  • the oil gallery 33A and oil pump 47 and oil pressure controller 46 constitute the driving means.
  • the solenoid valve 46A for the low speed running When the solenoid valve 46A for the low speed running is activated, it is switched to the position (FIG. 19) for supplying the pressured oil to the oil gallery 33A from the oil pump 47 as shown in FIG. 18. On the other hand, the other solenoid valve 46A for the high speed running is maintained at the initial position not to supply the oil to the oil gallery 33A.
  • the coupling plunger 44 associated with the low speed running is operated a shown in FIGS. 6 and 7, and projects to the opening 37B of the first sub-rocker arm 37 against the bias of the compression spring 45 to couple the first sub-rocker arm 37 with the rocker shaft 33.
  • driving force is transmitted between the sub-rocker arm 37 and the rocker shaft 33 to control the opening and closing of the valves in response to the movement of the cam 34 for the low speed running.
  • the plunger 44 for the high speed side remains in the through hole 33B of the rocker shaft 33 as shown by double-dot line in FIG. 21. Transmission of the driving force is interrupted between the second sub-rocker arm 38 and the rocker shaft 33 associated with the high speed running so that the high speed cam 35 does not control the valves.
  • the solenoid valve 46A for the high speed side When the engine speed is increased to reach a high speed range, the solenoid valve 46A for the high speed side is activated. In this case, the plunger 44 for the high speed side projects to the opening 38B of the second sub-rocker arm 38 as shown by the solid line in FIG. 21. Then, the rocker shaft 33 and the second sub-rocker arm 38 are coupled so that the driving force can be transmitted between them. The plunger 44 for the low speed side is disengaged from the opening 37B of the first sub-rocker arm 37, and moves into the through hole 33B of the rocker shaft 33.
  • valves are controlled by the cam 35 for the high speed running.
  • the cams are made not to control the valves associated with engine cylinders which are selected to be placed in a standby mode.
  • the controller 46B releases activation of the solenoid valves 46A.
  • the sub-rocker arms 37, 38 are not controlled by the movement of the cams 34, 35, and valves are stopped, so that some cylinders are in the standby mode.
  • This standby mode is switched to the operation mode in which the plungers 44 assumes a position depending upon the engine speed when the low load condition is canceled.
  • transmission of the driving force to the sub-rocker arm for the low speed running can be interrupted.
  • driving torque can be decreased, and the valves can be opened and closed more efficiently during the high speed running.
  • FIGS. 22 to 29 show the coupling plungers whose heads are normally engaged in the openings of the sub-rocker arms.
  • the components identical to those in FIGS. 14 to 21 are assigned the same reference numerals.
  • FIG. 22 is a cross-sectional view showing a structure for pivotally supporting the first sub-rocker arm 37.
  • an opening 37B is formed at a position on the circumferential surface of the first sub-rocker arm 37 above the through hole 33B.
  • a receptor is located at the upper portion of the opening 37B and is larger in diameter than the opening 37B.
  • a cover 51 is attached on the receptor by caulking.
  • the plunger 52 has an oil path 52A, one end of which communicates with the oil gallery 33A and the other end of which opens at the cover 51, and a cylindrical member 52B which is closed at the top and is open at the bottom.
  • a compression spring 54 is located in the cylindrical member 52B at a position above a spring receiver 53 mounted on the inner circumferential surface of the first sub-rocker arm 37.
  • the plunger 52 is biased by the compression spring 54 to project its head toward the opening 37B.
  • holes on the spring receiver 53 and the sub-rocker arm 37 communicate with the atmosphere to enable contraction and expansion of the compression spring 54.
  • the second engaging means comprises the opening 37B of the sub-rocker arm, through hole 33B of the rocker shaft 33, plunger 52 and compression spring 54.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US07/725,606 1990-07-10 1991-07-03 Valve system for automobile engine Expired - Fee Related US5099806A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP18213290A JP2503737B2 (ja) 1990-07-10 1990-07-10 自動車用動弁装置
JP18213190A JP2503736B2 (ja) 1990-07-10 1990-07-10 自動車用弁装置
JP2-182131 1990-07-10
JP2-182132 1990-07-10

Publications (1)

Publication Number Publication Date
US5099806A true US5099806A (en) 1992-03-31

Family

ID=26501053

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/725,606 Expired - Fee Related US5099806A (en) 1990-07-10 1991-07-03 Valve system for automobile engine

Country Status (3)

Country Link
US (1) US5099806A (ko)
KR (1) KR950005088B1 (ko)
DE (1) DE4122827C2 (ko)

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5186128A (en) * 1990-01-18 1993-02-16 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve operating apparatus
US5239952A (en) * 1991-11-08 1993-08-31 Atsugi Unisia Corporation Valve actuating apparatus
US5282443A (en) * 1991-12-09 1994-02-01 Honda Giken Kogyo Kabushiki Kaisha Valve operating system in internal combustion engine
EP0583584A1 (en) * 1992-07-16 1994-02-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve operating system structure with variable valve timing mechanism
US5320082A (en) * 1992-03-05 1994-06-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
US5331866A (en) * 1991-06-28 1994-07-26 Volkswagen Ag Camshaft arrangement having a deactivatable cam
AU651925B2 (en) * 1992-03-11 1994-08-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Multi-cylinder internal combustion engine
US5345904A (en) * 1990-02-16 1994-09-13 Group Lotus Valve control means
US5351662A (en) * 1990-02-16 1994-10-04 Group Lotus Plc Valve control means
US5373817A (en) * 1993-12-17 1994-12-20 Ford Motor Company Valve deactivation and adjustment system for electrohydraulic camless valvetrain
AU657040B2 (en) * 1992-02-28 1995-02-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
US5394841A (en) * 1992-10-30 1995-03-07 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Control device for valve system in automobile engine
US5417191A (en) * 1992-02-28 1995-05-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Control device for automobile engine including a valve system which opens and closes intake and exhaust valves by reciprocative force of crankshaft
US5419290A (en) * 1990-02-16 1995-05-30 Group Lotus Limited Cam mechanisms
EP0661417A2 (en) * 1993-12-24 1995-07-05 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
US5445117A (en) * 1994-01-31 1995-08-29 Mendler; Charles Adjustable valve system for a multi-valve internal combustion engine
US5445115A (en) * 1992-12-16 1995-08-29 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve system for internal combustion engine
US5496229A (en) * 1992-03-26 1996-03-05 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve actuator responsive to gear shift for reducing torque shock
US5701857A (en) * 1995-10-12 1997-12-30 Unisia Jecs Corporation Cylinder valve operating system
US5711387A (en) * 1992-09-04 1998-01-27 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Engine cooling system
US5875748A (en) * 1994-02-09 1999-03-02 Ina Walzlager Schaeffler Ohg Device and method for operating a valve drive of an internal combustion engine
US6435148B1 (en) * 2000-10-02 2002-08-20 Ina Walzlager Schaeffler Ohg Switchable support element
US20030075129A1 (en) * 1999-07-01 2003-04-24 Spath Mark J. Valve lifter assembly for selectively deactivating a cylinder
US20040074462A1 (en) * 2002-10-18 2004-04-22 Dhruva Mandal Lash adjuster body
US20040154571A1 (en) * 2002-10-18 2004-08-12 Dhruva Mandal Roller Follower assembly
US20050120989A1 (en) * 2002-02-06 2005-06-09 Norbert Geyer Switch element for valve actuation in an internal combustion engine
US20060005796A1 (en) * 2004-05-06 2006-01-12 Robb Janak Primary and offset actuator rocker arms for engine valve actuation
US20060236969A1 (en) * 2005-04-26 2006-10-26 Falkowski Alan G Rocker Shaft Arrangement for an Engine
US20060236968A1 (en) * 2005-04-26 2006-10-26 Falkowski Alan G Valvetrain System for an Engine
US20060249110A1 (en) * 2005-05-09 2006-11-09 Fernandez Hermes A Two-step roller finger follower
US20090159029A1 (en) * 2007-11-21 2009-06-25 Mario Kuhl Switchable Tappet
US20110061615A1 (en) * 2009-09-17 2011-03-17 Hendriksma Nick J Apparatus and Method for Setting Mechanical Lash in a Valve-Deactivating Hydraulic Lash Adjuster
US20110180027A1 (en) * 2008-06-16 2011-07-28 Michael Hartlieb Valve Train for Gas Exchange Valves of an Internal Combustion Engine Having a Double-Supported Cam Carriers
USRE44864E1 (en) 2001-09-19 2014-04-29 Ina Schaeffler Kg Switching element for a valve train of an internal combustion engine
CN110431287A (zh) * 2017-03-31 2019-11-08 斯堪尼亚商用车有限公司 与四冲程内燃机相关的车辆和方法
US11193401B2 (en) * 2019-12-27 2021-12-07 Yamaha Hatsudoki Kabushiki Kaisha Lost motion mechanism, valve gear and engine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310734C2 (de) * 1993-04-01 1999-06-02 Audi Ag Ventilbetätigungsmechanismus für eine Brennkraftmaschine
DE19643711A1 (de) * 1996-10-23 1998-04-30 Audi Ag Ventilbetätigungsvorrichtung für eine Brennkraftmaschine
DE10347329A1 (de) * 2003-10-11 2005-05-04 Ina Schaeffler Kg Schlepphebel eines Ventiltriebs einer Brennkraftmaschine
FR2971012A1 (fr) * 2010-12-22 2012-08-03 Valeo Sys Controle Moteur Sas Culbuteur debrayable pour deconnexion de soupape.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4724802A (en) * 1986-01-29 1988-02-16 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an automotive engine
US4768475A (en) * 1986-02-28 1988-09-06 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an automotive engine
US4844023A (en) * 1987-01-08 1989-07-04 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
US4848285A (en) * 1986-10-15 1989-07-18 Honda Giken Kogyo Kabushiki Kaisha Valve operating apparatus for an internal combustion engine
US4883027A (en) * 1987-11-25 1989-11-28 Honda Giken Kogyo Kabushiki Kaisha Valve operating system for internal combustion engines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5786512A (en) * 1980-11-17 1982-05-29 Mitsubishi Motors Corp Stopping mechanism of valve rocking action
DE3613912A1 (de) * 1985-04-26 1986-10-30 Mazda Motor Corp., Hiroshima Variabler ventilmechanismus fuer verbrennungsmotoren
GB2179700B (en) * 1985-08-29 1989-08-09 Nissan Motor Rocker arm arrangement for multi-valve internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4724802A (en) * 1986-01-29 1988-02-16 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an automotive engine
US4768475A (en) * 1986-02-28 1988-09-06 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an automotive engine
US4848285A (en) * 1986-10-15 1989-07-18 Honda Giken Kogyo Kabushiki Kaisha Valve operating apparatus for an internal combustion engine
US4844023A (en) * 1987-01-08 1989-07-04 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
US4883027A (en) * 1987-11-25 1989-11-28 Honda Giken Kogyo Kabushiki Kaisha Valve operating system for internal combustion engines

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE35662E (en) * 1990-01-18 1997-11-18 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve operating apparatus
US5186128A (en) * 1990-01-18 1993-02-16 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve operating apparatus
US5345904A (en) * 1990-02-16 1994-09-13 Group Lotus Valve control means
US5351662A (en) * 1990-02-16 1994-10-04 Group Lotus Plc Valve control means
US5419290A (en) * 1990-02-16 1995-05-30 Group Lotus Limited Cam mechanisms
US5331866A (en) * 1991-06-28 1994-07-26 Volkswagen Ag Camshaft arrangement having a deactivatable cam
US5239952A (en) * 1991-11-08 1993-08-31 Atsugi Unisia Corporation Valve actuating apparatus
US5282443A (en) * 1991-12-09 1994-02-01 Honda Giken Kogyo Kabushiki Kaisha Valve operating system in internal combustion engine
AU657040B2 (en) * 1992-02-28 1995-02-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
US5441020A (en) * 1992-02-28 1995-08-15 Mitsubishi Jidosha Kogyou Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
US5427064A (en) * 1992-02-28 1995-06-27 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
US5417191A (en) * 1992-02-28 1995-05-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Control device for automobile engine including a valve system which opens and closes intake and exhaust valves by reciprocative force of crankshaft
AU652889B2 (en) * 1992-03-05 1994-09-08 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
US5320082A (en) * 1992-03-05 1994-06-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve-moving apparatus for internal combustion engine
AU651925B2 (en) * 1992-03-11 1994-08-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Multi-cylinder internal combustion engine
US5496229A (en) * 1992-03-26 1996-03-05 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve actuator responsive to gear shift for reducing torque shock
US5353756A (en) * 1992-07-16 1994-10-11 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve operating system structure with variable valve timing mechanism
EP0583584A1 (en) * 1992-07-16 1994-02-23 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve operating system structure with variable valve timing mechanism
US5711387A (en) * 1992-09-04 1998-01-27 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Engine cooling system
US5394841A (en) * 1992-10-30 1995-03-07 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Control device for valve system in automobile engine
US5445115A (en) * 1992-12-16 1995-08-29 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve system for internal combustion engine
US5373817A (en) * 1993-12-17 1994-12-20 Ford Motor Company Valve deactivation and adjustment system for electrohydraulic camless valvetrain
EP0661417A2 (en) * 1993-12-24 1995-07-05 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
EP0661417A3 (en) * 1993-12-24 1995-10-18 Honda Motor Co Ltd Valve control device for internal combustion engine.
US5553584A (en) * 1993-12-24 1996-09-10 Honda Giken Kogyo Kabushiki Kaisha Valve operating device for internal combustion engine
US5445117A (en) * 1994-01-31 1995-08-29 Mendler; Charles Adjustable valve system for a multi-valve internal combustion engine
US5875748A (en) * 1994-02-09 1999-03-02 Ina Walzlager Schaeffler Ohg Device and method for operating a valve drive of an internal combustion engine
US5701857A (en) * 1995-10-12 1997-12-30 Unisia Jecs Corporation Cylinder valve operating system
US20030075129A1 (en) * 1999-07-01 2003-04-24 Spath Mark J. Valve lifter assembly for selectively deactivating a cylinder
US20070295293A1 (en) * 1999-07-01 2007-12-27 Spath Mark J Valve lifter assembly for selectively deactivating a cylinder
US7263956B2 (en) * 1999-07-01 2007-09-04 Delphi Technologies, Inc. Valve lifter assembly for selectively deactivating a cylinder
US7673601B2 (en) 1999-07-01 2010-03-09 Delphi Technologies, Inc. Valve lifter assembly for selectively deactivating a cylinder
US6435148B1 (en) * 2000-10-02 2002-08-20 Ina Walzlager Schaeffler Ohg Switchable support element
USRE44864E1 (en) 2001-09-19 2014-04-29 Ina Schaeffler Kg Switching element for a valve train of an internal combustion engine
US20050120989A1 (en) * 2002-02-06 2005-06-09 Norbert Geyer Switch element for valve actuation in an internal combustion engine
US20060219199A1 (en) * 2002-02-06 2006-10-05 Ina-Schaeffler Kg Switching element
US20060191503A1 (en) * 2002-02-06 2006-08-31 Ina-Schaeffler Kg Switching element for a valve train of an internal combustion engine
US7207303B2 (en) 2002-02-06 2007-04-24 Ina-Schaeffler Kg Switching element
US7210439B2 (en) 2002-02-06 2007-05-01 Ina-Schaeffler Kg Switching element for a valve train of an internal combustion engine
US7464680B2 (en) 2002-02-06 2008-12-16 Ina-Schaeffler Kg Switching element for a valve train of an internal combustion engine
US20040154571A1 (en) * 2002-10-18 2004-08-12 Dhruva Mandal Roller Follower assembly
US20040074462A1 (en) * 2002-10-18 2004-04-22 Dhruva Mandal Lash adjuster body
US20060005796A1 (en) * 2004-05-06 2006-01-12 Robb Janak Primary and offset actuator rocker arms for engine valve actuation
US7392772B2 (en) 2004-05-06 2008-07-01 Jacobs Vehicle Systems, Inc. Primary and offset actuator rocker arms for engine valve actuation
US20060236969A1 (en) * 2005-04-26 2006-10-26 Falkowski Alan G Rocker Shaft Arrangement for an Engine
US20060236968A1 (en) * 2005-04-26 2006-10-26 Falkowski Alan G Valvetrain System for an Engine
US7530338B2 (en) 2005-04-26 2009-05-12 Chrysler Llc Valvetrain system for an engine
US7415954B2 (en) 2005-04-26 2008-08-26 Chrysler Llc Rocker shaft arrangement for an engine
US7305951B2 (en) * 2005-05-09 2007-12-11 Delphi Technologies, Inc. Two-step roller finger follower
US20060249110A1 (en) * 2005-05-09 2006-11-09 Fernandez Hermes A Two-step roller finger follower
US20090159029A1 (en) * 2007-11-21 2009-06-25 Mario Kuhl Switchable Tappet
US8161929B2 (en) 2007-11-21 2012-04-24 Schaeffler Kg Switchable tappet
US20110180027A1 (en) * 2008-06-16 2011-07-28 Michael Hartlieb Valve Train for Gas Exchange Valves of an Internal Combustion Engine Having a Double-Supported Cam Carriers
US9103243B2 (en) * 2008-06-16 2015-08-11 Audi, Ag Valve train for gas exchange valves of an internal combustion engine having a double-supported cam carriers
US8196556B2 (en) 2009-09-17 2012-06-12 Delphi Technologies, Inc. Apparatus and method for setting mechanical lash in a valve-deactivating hydraulic lash adjuster
US20110061615A1 (en) * 2009-09-17 2011-03-17 Hendriksma Nick J Apparatus and Method for Setting Mechanical Lash in a Valve-Deactivating Hydraulic Lash Adjuster
CN110431287A (zh) * 2017-03-31 2019-11-08 斯堪尼亚商用车有限公司 与四冲程内燃机相关的车辆和方法
US11193401B2 (en) * 2019-12-27 2021-12-07 Yamaha Hatsudoki Kabushiki Kaisha Lost motion mechanism, valve gear and engine

Also Published As

Publication number Publication date
KR950005088B1 (ko) 1995-05-18
DE4122827A1 (de) 1992-01-16
KR920002902A (ko) 1992-02-28
DE4122827C2 (de) 1999-10-14

Similar Documents

Publication Publication Date Title
US5099806A (en) Valve system for automobile engine
US4576128A (en) Valve operation stopping means for multi-cylinder engine
US7469669B2 (en) Variable valve train mechanism of internal combustion engine
JPH036801Y2 (ko)
JP2810442B2 (ja) エンジンの弁作動装置
US4934348A (en) Valve operation control system of internal combustion engine
US5960756A (en) Valve control device for an internal combustion engine
US4957076A (en) Valve operating mechanism for an internal combustion engine
JPH0874545A (ja) 多気筒内燃機関の動弁装置
KR950010232Y1 (ko) 다실린더내연기관
JPH06101437A (ja) エンジンの動弁装置
CA2486440A1 (en) Valve train device for engine
KR100974122B1 (ko) 내연 기관의 밸브 구동 장치
EP0524314B1 (en) Valve mechanism in internal combustion engine
JP3746786B2 (ja) カム機構
US5794576A (en) Engine cylinder valve controlling apparatus
JP2003120241A (ja) 可変動弁機構
US6125804A (en) Variable valve lift device
US5275137A (en) Valve operating system for engine
JPH0586822A (ja) 内燃機の少なくとも一つの弁のリフト機構を制御する装置
JP2781034B2 (ja) エンジン用可変バルブ装置
JPH0523763Y2 (ko)
JP2002188418A (ja) 内燃機関の可変動弁装置
JPH0459448B2 (ko)
JPH02221612A (ja) 内燃機関の可変動弁装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MURATA, SHINICHI;NAKAMURA, NOBORU;YOSHIDA, MICHIYASU;REEL/FRAME:005764/0794

Effective date: 19910624

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 20000331

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362